Answer:
20%
Step-by-step explanation:
Subtract the original number from the new number: 90-75=15
The increase is 15
Now divide the increase by the original number: 15/75=.20
Then multiply your answer by 100: .20x100=20
Here is your perfect answer
2.5 hours, because 10 miles an hour times 2 = 20 plus half the time? 2.5